AC blew cold yesterday...today it only blown ambient air temp. The fuse is not blown, the blower motor works fine. I paid to have freon checked (full), and there is power signal to the clutch. The shop quoted me $805 to replace my compressor. When I asked if the clutch could be the problem, he stammered that regardless, I need to replace the compressor....kinda ticked me off. So....a new compressor clutch is $135. Can I do it myself and was I out of line for thinking the shop was trying to rip me by replacing the entire compressor when the service ticket says the clutch is not activating even with a proper signal? I also see on the interweb that the clutch offset has to be properly set for the clutch to engage...I wonder if a puller and an alignment is all I need? I'd rather replace the clutch myself for $135 than pay the shop $805 to 'replace everything to solve the problem'. Thoughts/advice?